Added new parameters to user preferences for company view and resource load filtering

FEA: ItEr77S15FilteringEnhancements
Defined hibernate configuration for filtering parameters persistance

FEA: ItEr77S15FilteringEnhancements
Added database changelog for filtering preferences

FEA: ItEr77S15FilteringEnhancements
Added initial interface to user preferences for company and resourcesload filtering configuration

FEA: ItEr77S15FilteringEnhancements
Added accesors to settings controller for manipulation of filtering preferences

FEA: ItEr77S15FilteringEnhancements
Adapted dates filter to user preferences

It will substract N months to the current date and use it as the start
date for the compan view filtering, being N the 'projects since'
parameter on the user settings tab.

Similarly, it will add M months to the current date and use it as
the filtering end date with the specified parameter.

FEA: ItEr77S15FilteringEnhancements
Added onchange listeners to company view date filter widgets

FEA: ItEr77S15FilteringEnhancements
Storing on the session the values for the company filtering dates

FEA: ItEr77S15FilteringEnhancements
Setting company filtering dates with session values if they have been set

FEA: ItEr77S15FilteringEnhancements
Used stored user settings parameters for ResourceLoad date filtering

FEA: ItEr77S15FilteringEnhancements
Added session based memory for Resource Load filtering date parameters

FEA: ItEr77S15FilteringEnhancements